Just one little detail more:
In any hotel I know, whoever makes his payment in cash, they never pay ITEBIS and never declare that income. And it is not just very small hotels. Of course not the AI resorts (I hope, but who knows...)
And by the way, if a client pays by credit card, then the ITEBIS is declared, but that's more because the one intelligent move DR made ist to use the credit card organisations to collect part of the ITEBIS directly via the surcharge of the credit card payment AND to transmit all transactions to the authority. That was the only way to get the tax to be paid. Any payment not entering via credit cards goes the usual Dominican way....
This tax argument isn't really the best of all arguments. beside of that if airbnb agrees, they can do it JUST the same way like the credit card companies, directly subtract it from the payments. Easy and proven.